Example
The market for cookies is huge, with many consumers and many sellers.
The supply follows the equation `Q_S = 3 P`.
The demand follows the equation `Q_D = 10 - 2 P`.
In equilibrium, supply equals demand $$ \begin{align*} Q_S &= Q_D \\ 3 P &= 10 - 2 P \\ 5 P &= 10 \\ P &= 2 \end{align*} $$
In equilibrium, a banana is sold for $2 and there are 6 bananas on the market.
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